Support beam



FIG. 1 is a top, front, left perspective view of a support beamillustrating my new design;

FIG. 2 is a top view thereof;

FIG. 3 is bottom view thereof;

FIG. 4 is a front view thereof;

FIG. 5 is a back view thereof;

FIG. 6 is a left side view thereof; and,

FIG. 7 is a right side view thereof.

The support beam is shown with a symbolic break in its length. Theappearance of any portion of the article between the break lines formsno part of the claimed design.

CLAIM The ornamental design for a support beam, as shown and described.